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HydroFill Auto Top Off ATO Controller - Innovative Marine


Item #: 0I10527

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Automate freshwater replenishment, and say farewell to heavy lifting, unstable water parameters, and the need to frequently watch your water line. Topping off evaporated water for our aquariums is a tedious but essential task that every hobbyist encounters to maintain stable specific gravity & salinity levels.

The HydroFill Ti ATO Controller takes advantage of your water`s conductive properties to complete a low voltage circuit and cause a control relay to actuate and replenish water as it evaporates. This departure from outdated float sensors, offers the latest automation in electronic sensing for precise accuracy, repeatability, and no-moving part reliability.

Customize your own "High and Low" set points to prevent constant On/Off cycling prone to single sensor design.

Sensors utilize rare earth neodymium magnets for stationary placement and simple out of the box installation. Small form factor makes it the ideal choice for nano to full size aquariums. Two Titanium electrodes are housed in each sensor for redundancy & consistent long-term performance in harsh marine environments.

  • 1-Year Manufacturer`s Warranty
  • Titanium Conductivity Sensors
  • For use in Fresh & Marine Applications
  • Controller Dims: 3.35” x 1.18” x 5.12”
  • Includes Double Sided Adhesive
  • 1000W, 8Amp/120V Pump Capacity
  • Power Consumption: < 1 Watt
  • Visual LED indicators
    a. Power -Red
    b. Level - Green
    c. Low Level – Green
    d. Water Filling – Pulsing Green
  • Compact size: 1.25” x 1.06” x 2”
  • 2 Sensor Design
  • Safe 5V Low Voltage
  • 6 foot sensor cables
  • (2) Rare Earth Neodymium Magnetic Sensor Holders
  • Titanium Electrodes (magnets can support up to ½” wall thickness)

4 Stars


Reviewed on
February 24, 2021

Yes, I would recommend this.

Good Controller

Pros: Nice Controller

Cons: You won't know when the sensor stop working, and you might lose a pump.

The sensor will built salt on the sensor and will stop working, I call the company and I was told clean the sensor once a month, because the salt would built around the sensor and will not work.

Was this review helpful? 0 0


Reviewed on
December 06, 2018

Yes, I would recommend this.

Works Fine

Pros: Straightforward Controller

Cons: Needs a better way to hold the sensor cords

Setup was easy. Cords were long enough. I was confused if there was a specific high or low sensor, but I found out that it didn’t matter which one was placed high or low. LED readout is straightforward. I wish they had a better way to hold the sensor cords level to the water other than a suction cup.

Was this review helpful? 1 0


Reviewed on
October 18, 2018

No, I would not recommend this.

does not work for prolonged use

Pros: looks clean, will maintain constant level when working properly

Cons: very prone to sensor failure

This works IF the probes stay dry. If there is any way that spray from bubbles or current or waves get on the sensors they do not register as "dry" and send a signal to the controller to start your pump. I consistently have to remove one or both from my sump, dry them, and return them to the sump to get them to run properly for the next 24-36 hours, at which point they stop working and need to be dried again. This makes them useless for any extended vacation time where you will be away from your tank for more than 36 hours. I have had this unit less than 6 months, probably should have returned it as it initially failed during the warranty period.

Was this review helpful? 0 1


Reviewed on
August 14, 2018

No, I would not recommend this.

Does not work out of the box.

Pros: good price

Cons: bad probes. no replacements available

I received my IM Hydrofill ti ATO and pump. After setting everything up and priming the pump, the controller does not work. I get power light and a high light. Sometimes the controller will blink between low and high but never kick the pump on. Bad probes out of the box.

Was this review helpful? 0 6


Reviewed on
February 25, 2018

Yes, I would recommend this.

Simple, Easy

Pros: Simply, clean design, functional

Cons: Pump sold separate.

Pretty basic design. Use it in my IM 25 Lagoon and it works very well. Only down fall is that you have to buy the pump separate and it is a little noisy.

Was this review helpful? 0 0


Reviewed on
January 05, 2018

Yes, I would recommend this.

Great little ATO

Pros: Simple and easy

Cons: None so far

This works great in the back of my JBJ RL45. I have the sensor probes set to pump about 1-2 ounces of topoff at a time.

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Reviewed on
November 25, 2017

No, I would not recommend this.

Bad probe

Pros: Good controller

Cons: Bad probes

After about 4-6 months probes short out. Both probs out of water, pump not running. Need to unplug a probe to start filling. Would like to see replacement probes for this. Also an upgrade on controller with a manual fill.

Was this review helpful? 4 0


Reviewed on
November 12, 2017

Yes, I would recommend this.

Great little ATO

Pros: NIce looking, small footprint in tank

Cons: none

Have not had any issues with this ATO. I run it with the IM pump and they work great. I check the magnets with my daily tank look over and they have not moved and they don't take up much room in my 28 gal jbj nano. I would buy again. I also looks nice.

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Reviewed on
October 23, 2017

Yes, I would recommend this.


Pros: works great never had any issues, sleek design

Cons: none

It works great I never had any problems sleek design

Was this review helpful? 0 1


Reviewed on
October 10, 2017

Yes, I would recommend this.

Great ATO System

Pros: First one! Great system to start off with!

Cons: none so far

It's my first ATO system but it works great! I don't have to worry about salinity swings

Was this review helpful? 0 2

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